mark b Posted August 31, 2003 Share Posted August 31, 2003 Here is a trickey one. Just seen the spec for the new mac 550. The blurb claims to produce 9,700 lumens from a 400w source. Now I am confused as I thought that mac 500's chucked out 16,000 or so lumens? Are martin using a different measurement technique? Am I wrong? (quite probable). And does anybody know how to convert readings in LUX to Ansi lumens? Why am I asking weird questions on a sunday morning!? help. Link to comment Share on other sites More sharing options...
Bryson Posted August 31, 2003 Share Posted August 31, 2003 A conversion chart It seems that 1 lux = 1 lumen per square metre. So that's nice and easy. Link to comment Share on other sites More sharing options...
themadhippy Posted August 31, 2003 Share Posted August 31, 2003 one lux is one lumen per square meter.ansi is the american nattional standard institute, im guessing 1 ansi lumen =1 lux Link to comment Share on other sites More sharing options...
Brian Posted August 31, 2003 Share Posted August 31, 2003 The Lumen is the measure for luminous flux which is the total light output of a source. The Lux is the measure of illuminance which is the amount of light falling on a surface of a given size and it's in lumens/sq m. So in the mac550 we have 9750 lumens generated by the lamp consuming 400W, which actually seems a bit low. The implied efficiency from this is about 24 lumens/watt where I'd expect closer to 95. To work out the lux you need to know the beam angle of the optics and the distance from the surface being lit. Link to comment Share on other sites More sharing options...
mark b Posted September 1, 2003 Author Share Posted September 1, 2003 AH HA! clarification! as the clouds of murk clear things become apparent! Time to go away and do some sums! Thanks. :D Link to comment Share on other sites More sharing options...
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